“…Street theatre is the best way to describe Jesus’ actions on the first Palm Sunday. It wasn't entertainment, though people had a great day out. Jesus was saying something you couldn't say any other way. Part of the question of Palm Sunday is what it all meant, what it all means today. Which story was he enacting? What sort of king was he becoming?
Jesus didn't do a lot of this kind of thing. He clearly intended that these actions would resonate, sending echoes bouncing off the walls not only of Jerusalem but of the Scripture-soaked imaginations of the bystanders, particularly his disciples, who may have thought they were following a Theseus only to find that their king had turned into a stranger, darker monarch who they became afraid to know. Which story were they living in? Which king did they think they were following?...”
~ NT. Wright, What Palm Sunday Means: God's Street Theatre Comes to Jerusalem (complete article can be found online here).